Image Issues in Bueno Theme

I'm using the 'Bueno' theme. The theme is working out well, but there's a problem with it.

There is a featured post section, where an author can add posts along with photos. Whenever I update the section, the images over there come as thumbnails. All's well! But the problem is if I add images in featured post section, then images from the main article doesn't appear. I can't see any image when I click on any particular article to read it whole.

Again, in the home page, the images on each article seem to be present but they appear as distorted images, while the thumbnails on featured posts seems to be okay.

Please let me how to add images both in featured posts and main article without any problem at all.